Hi, I have some questions about IPC-TM-650 Number 2.4.21D. These questions are as follows: 1. Do the unsupported component hole contain plated-through hole (PTH) and not plated-through hole (NPTH)? ( In old version (version C), it contains plated-through hole (PTH) and not plated-through hole (NPTH).) And why do the method have the change? 2.The specification about Land Bond Strength test which is described in IPC- 6012A paragraph 3.7.3 is to withstand 2 kg or 35 kg/(cm*cm), whichever is less. Is it right? what does 2 kg mean? Does 2 kg mean the load force L? Is the calculation of 35 kg/(cm*cm) in accordance with the formulation which is described in IPC-TM-650 Number 2.4.21D? Please help me to solve these questions and e-mail to me. Thanks! Best Regards, --------------------------------------------------------------------------------- TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF TECHNET Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------